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Pyrantel Pamoate (you are probably used to hearing it called "Strongid") for less than a dime US per cat dose, Panacur for a buck or two (US) per dose, and a "Drontal"-equivalent for about $2.50 [US] per tablet.

Pyrantel Pamoate:
This is the same stuff your vet probably uses to worm for 
rounds and hooks; s/he probably refers to it by the brand name 
“Strongid.”  Refer to “The Pill Book” for dosage.  If you're 
worming lots of cats, the cheapest source *per ounce* is: 
Item #28901-8 is 8 ounces costs $12.95 and will provide about 
160 doses for, say, 7-pound cats. 16 ounce and 32 ounce sizes 
are also available for, of course, an even lower cost-per-ounce.  
If you aren't worming that-all many cats and want to 
buy a smaller quantity, 
sells 2 ounces of the same stuff for $7.  Remember that 
you need to re-worm in 7 to 10 days, or you won't 
break the roundworms' life cycle!!!
(Remember to buy syringes [of course you don't need 
needles since it's an oral wormer] to measure it with!)

Panacur (Fenbendazole):
Occasionally, a strain of worms crops up that's resistant 
to Pyrantel Pamoate. In these cases, Panacur (Fenbendazole) 
is generally effective.  However, it's considerably more 
hassle as it HAS TO be administered three days in a row,
and then repeat the 3-day process a week later to break the
worms' life cycle.   
Refer to “The Pill Book” for dosage. It's available in 
granules, paste, or suspension (liquid).  The suspension is 
by far the easiest to measure into cat-sized doses, but the 
catch is, it's only available by the liter (got some other 
rescue friends who might like to split a liter?).
* http://www.kvvet.com has it in all three forms
Item # 26401 is a 25 g tube of paste (I calculate it to 
     be enough to dose about (2) 9-pound cats the requisite 
     three days running and repeat again a week later) for 
     $5.49 at this writing.  
Item #28220 is a 5.2 g packet of granules (I calculate 
     it to be enough to dose one 8-pound cat for requisite 
     three days running and repeat again a week later).
Item #26101 is a liter of the suspension, which I reckon
   should dose about (90) 8# cats for the (2) three-day 
   courses of treatment a week apart.
* http://www.psol.com.au can special order the suspension 
    for you quite promptly, and save you probably US$20-30
     or so shipping costs included) compared to KV's price
I believe that Revival carries this, also. 

“Popantel for Cats” (Praziquantel + Pyrantel Pamoate)
tablets (same active ingredients as Drontal)
10 tablets A$39 (approximately US$22.17 – 
each tablet worms one 11 pound cat for tapes, rounds & 
hooks – need to re-worm 1-2 weeks later to break the 
rounds’ life cycle though!)  Note: this is actually a 
little MORE of the two active ingredients than is found 
in "Drontal for Cats and Kittens" -- the "Popantel" does 
about a pound more worth of cat.  Available from:
Australian online pet supplies – this wormer is not 
prescription in Australia.
Shipping is typically A$7 (approximately US$3.98) unless 
you order quite a bunch of stuff!  Orders typically 
arrive (in the Pacific Northwest) in about 9 days.  
(People on the US East Coast have reported even faster 
To figure your actual cost in YOUR currency at the time 
you're ready to order, there is an unrelated web site 
with a very handy currency converter at:

IMPORTANT NOTE: The "Popantel"/"Drontal" wormers have as 
their main claim to fame the fact that they kill rounds, 
hooks AND tapes.  However, remember two things: 
1) While it's not necessary to RE-worm for tapes *unless* 
the cat gets RE-infested by ingesting the tapeworm's 
intermediate host (usually a flea) again, the cat CAN be 
reinfested even by ingesting a DEAD flea.  Get rid of 
the fleas FIRST before you worm for tapes (whether you're 
using the "Popantel" OR the "Tapewormer" tablets!)
2) If you use the "Popantel" in order to get all the 
worms at once, it *IS* necessary to RE-worm for roundworms 
after 7-10 days.  The timing is critical in order to 
break the worms' life cycle.
Given these two facts, I prefer to treat incoming cats 
immediately with a flea treatment (such as Frontline) and 
Pyrantel Pamoate, re-worm with Pyrantel Pamoate 7-10 days 
later, then worm for tapes a week or two, even, after that.  
However, using "Popantel" instead of the *second* round 
of Pyrantel Pamoate would be a viable compromise, 
especially if you've been able to brush the cat to get 
the dead fleas out of the coat.