Although I have the knockoff ATG I use for a lot of things, I like to use my SNAIL adhesive most for cards. It's just easier for me to use when making a bunch of cards at one time and is more portable. I got in on a bulk buy 2 years ago on here and finally used them up and found myself needing more, and a friend of mine just passed along the link below. They are $2.10 a piece in a 24 pack and I've stuck a discount code below the link to bring them down cheaper....
http://new.penwa.com/products/TW_62202_24_PACK_Tombow_Mono_Adhesive_Permanent_Re \
fill_2_10_ea_USA_SHIPS_FREE_TODAY_Guaranteed_Lowes t_Price-10218-0.html
If you use the discount code "MONO" it will bring the price down to $2.06 a refill. It takes it under the $50 for free shipping, HOWEVER, it still gave me free shipping
Thought this might be useful for anyone else like me who likes to stock up on stuff so you don't run out LOL