Petsmart sell knock off ones in store for cheaper than Soft Claws if you can get to a petsmart. I actually prefer them to the 'real' ones. The color selection leaves something to be desired but having both a girl and a boy cat I can get 2 separate packages one for Attitude and one for Nuts.
Here they are on Amazon, they are called Kitty Caps, these are the ones I got for Attitude.
http://www.amazon.com/Medium-White-C...8939800&sr=8-3
these are the ones I got Nuts:
http://www.amazon.com/Medium-Navy-Gr...8939800&sr=8-4
Like I said I like these a lot more than Soft Claws, the glue seems stronger and bonds better and it isn't as messy, I didn't get glue on their foot fur. Attitude has Maine coon tufts on her feet which stick out(not mention copious amounts of fur on the bottom of her feet, but that doesn't matter) so getting caps on her claws is more difficult than your average cat. This isn't Attitude but if you look at the paws this is what I come up against getting caps on her claws, a lot of fur.
http://homepages.ihug.co.nz/~grins/m...ies%20feet.jpg
Nuts, while same as Attitude(they are siblings) has a DSH coat with no tufting so he's easy.
I get larges for them(they are each 10.5 lbs), medium is just too small for them. The larges are for cats 13 lbs and over but they have Maine Coon claws which are larger than normal cats claws(at 12 weeks old(and maybe 4-5 lbs) they wore smalls, kitten size was way too small) I'm patiently trying to wait for the too small medium soft claws to fall off so I can get the proper size Kitty Caps on them. Attitude's come off faster than Nuts(she already has a full paw of the new ones, plus 2 on her other foot.) Nuts has maybe 3 of the now ones on, the rest are the too small soft claws, which need to come off Nuts keeps getting his claws stuck in things. Just thought I'd mention that in case you have a Norwegian Forest cat or Maine Coon or other large boned cat. Attitude and Nuts are 13 months old so I'm not even sure if they'll fit into them eventually(they won't reach full size until around 3, and I can tell they are still growing.)
Like I said the Kitty Caps are less expensive and I prefer them over Soft Claws. They could have better cap colors for boys, but really the navy and gray look great, very classy. I had a harder time getting what I needed since I needed larges and they mostly had smalls and mediums since that is the size every other cat seems to wear except my huge ones.
Here are my 2 large wearing cats(so you have an idea of what cats who wear large look like.):
This is from May Nuts has grown since this(sorry for the crappy quality but this shows how long he, well, was he's longer now):

This is today, he's laying his head on his back feet as well as his front so he looks smaller than he really is:

This is Attitude, she wouldn't cooperate and I had to take her picture while she was behind the end table(this was the best one I could get) She is currently as long as Nuts was when I snapped the picture of him stretched out in May, obviously she's a little smaller than Nuts who is a he:

My signature picture is old, they would have been maybe a small sized cap when that was taken, back when they first came inside.
Taryn