The Kaps version that Ken Brooke put out was called "The Three Card Trick With Four Cards" if memory serves. I think Joe Riding was the Creator. The cards were not Gaffed and if you could figure out the instructions it was an amazing trick. I found the instructions a bit tough to decipher.
The one Steven's sells with the $ marks is a toss on "The Side Walk Shuffle"
I think the original "Sidewalk Shuffle" is something Martin Lewis worked out with Ken Brooke.
Anyway, depending on which type of cards you have gaffed or not both tricks are still commercially available. I can tell you from personal experience that lamination and dry erase markings work a treat!
I am a busker by trade and do between 15 or 20 shows a day in all types of weather conditions. For me lamination is a must unless I want to buy new cards every week. :)
When I get them laminated I go to a local Kinkos and have them encapsulated. This is a little different than lamination because the edges are also laminated. They heat the stuff on and basically put the card in a little shell. The reason (for me) that this is so great is that straight lamination has a tendency to make the cards split through the center sandwich style after a time.
Harry Anderson did a fantastic version of the three card trick with four cards on Saturday night live back in the early 80's. I remember it floored me because when he was finished with the trick he scaled the cards into the audience! No Gaffs!
About two years ago Mr. Anderson released a no gaff version using three cards called Monte Gras. If you like the original I think this one is much stronger. I bought a set and put the trick in my street act a month later and it just slays people!
Sorry to drone on so long but I just love this trick and it sounds like you are running into some of the same things I have. I would be remiss to let a fellow magi reinvent the wheel. I hope this was helpful. :)
P.S. Three card trick with four cards I got a copy from Hank Lee for about $10 Martin Lewis sells the sidewalk shuffle on his website for $20. It uses pips and not $.
a Giant plastic version of the trick can be found here: http://www.topsecretmagic.co.uk/cards2.html