Hi! If you want to buy toys cheap to sell contact Petedge.com they have cheap toys and maybe if you call them and tell them what its for they will give it you cheaper. Doesnt hurt to ask. Then go to your local party shop or make up a ribbone or something saying what it was from and palce on toys. You already have a great idea's. I make my pets bandans all the time not the best at it but I have a sewing machine that can embroider info on it so let me know if I can help you. Just PM Me I just need sometime to do them.
Rio&Nickysmommy
P.S> You might also ask some companies if they are willing to donate some toys.