I'm struggling to find anywhere that does maternity exercise clothes, let alone at reasonable prices. Have found a few places online where bottoms cost £45+ which is at least three times what I normally spend. Ideally I need 2-3 pairs to save having to do a wash every day, but don't want to spend £100+ on exercise clothes that will be only worn for a couple of hours a time for a few months!
Normal maternity non-exercise leggings etc aren't a great solution - have tried and they don't stay up well for running/aerobics. Tops - less of an issue, I can wear baggy tshirts (or borrow DH's), but finding cropped or long exercise trousers is a real pain! I just want my normal stretchy bottoms with space for my bump 
Have also tried pulling it right up - not good wedgie and rolling the waistband down below my bump just meant they fell down more easily.
I have tried going up sizes in non-maternity - ok for a few weeks, but once I got a couple of sizes up, they were too big on legs and bottom so were still falling down!
Any ideas?