I wrote zupreem and roudybush. Zupreem doesn't offer samples but do offer a money back guarantee if the birds won't eat the food. Still don't want to buy a big bag, seems silly that you can't get a little 4oz bag.
Still waiting to hear back from roudybush but I don't expect them to have samples either.
I ended up just buying some zupreem since there is a money back guarantee and the birds love it, they really like harrisons too.
One really big surprise, I got a pound of roudybush in the mail today. 8oz each of the nibles and the crumbles. That was a huge surprise, especially since they never answered my email. Love to see things like this from companies. I have enough pellets to last quite a long time now