I use the Viralays Gel. As soon as it hits the cats mouth it dissolves and they cannot spit it out like a paste. It can also be drawn up into a small feeding syringe. If you put it on your finger you have seconds to get it into the cats mouth. My cats will not eat lysine treats. I think Dr. Smiths and Foster makes a powder. If you're going to be fostering a lot of cats you might negotiate a can of it for your self. I prefer the gel because I know it's in their mouth. End of story.
The Viralays Gel is what I ordered on chewy! As well as a tub of the powder and a different kind of treats. I sort of went a little Lysine crazy but I figure since I foster so much I am bound to need more eventually!
I keep lysine on hand all the time as well as the antibiotic eye ointment. I keep a can of KMR, and adult liquid food along with some baby food and a feeding syringe. I don't know enough about cats to vet them on my own but having a survival kit is a must.
I am partial to the little ginger & white boys. But yes, those fluffy little tabbies are so adorable!!! I agree about the cream/ ginger & white tabby boys. They will be bigger. Long. Angel was long, so 13-14 lbs was an OK weight for him. The most he got up to was 15 lbs (after taking amatriptyline for a little while, when he had cystitis, to relax the bladder). 
