Questions about cremation

So, my rats are quite young still, and have much life ahead of them, but I like to plan for the future. I've been looking into getting each of my rats cremated. Mainly what I'm asking here, is if anyone has any services they can recommend to me, or perhaps inform me of what that could cost for a rat. The other option was taxidermy, but this quite unsettles me, as I'm basically just keeping my rats corpse on a shelf. Where I live, I'm technically not supposed to be owning rats, so there's no chance I could bury them near my house or anything, as that could result in me being asked to move. Advice?