Giai Belly butter is good and under $20 a tube I think

Pure almond oil - get it from the health food shop, it comes in a huge bottle (cause it's used for cooking too) and is really cheap (about $11 I think I paid) and is one of the higgest concentrations of vit E without chemicals etc... I bought a bottle at 8 weeks and haven't even used a tenth of the bottle and I am now 34 weeks, no smell to it and it's not greasy considering it's oil!

Mum to be stretch mark cream, it's organic but a bit more expensive than the other options, you can buy it from tots n tales online baby store.

Burt's bees also have a tummy butter that smells ok, bit funky IMO but it also is on the more expensive side but is organic.

I am using the almond oil to prevent stretchies and Sukin moisturiser to keep my skin hydrated.. so far only have 3 dot stretchies on my hip that look like little bruises, not big purple lines and strechies in my family are usually huge and very obvious!!!

Good luck sweets!