Don't wory Peanut - mine are the same, and I have had two CD22 tests to confirm ovulation :-) I can go 4 or 5 days at the same temp, go up or down by 0.1 and then back to the same temp again. As long as you're seeing a change around ovulation time, then you're fine and ovulating
I got my thermometer from www.themotherstore.co.nz - I think they only stock the one type, and I found it was a really good one to use.