My boa's starting to look like he's too big for XL rats. I feed once a week. I am starting to think I'm getting ripped off at my local herp store because I'm sure one of those "XL" rats was actually a large. (And the only hopper size mice they have, for my milksnake, happen to look like fuzzies...)

All rip-offs aside, I just fed my boa a rat and he's still poking his head around looking for food. Last measure I had was at about 5'5" about a month ago. I don't have a weight for him either. What size do you go to when XL rats don't seem like they're enough? And just for kicks, what's the largest size food item you feed your boas/frequency of said item?