Try Winstanleys BMX, they have some proper BMX bikes for that kind of money.
A word of warning, I was picking my 7 year old up from school and one of the mums was complaining about the brake on her son's new BMX, I had a look, the brake was badly adjusted. I sorted it but was shocked that this bike had plastic levers, pressed steel V brake arms, loose headset and rear hub. It was less tha 2 weeks old and she'd paid £130 for it, she asked if she should take it back and get a refund as it already had been back to the shop. For that kind of money she could have a branded bike such as a Redline from Winstanleys or one of the other online suppliers.
The thing was just a piece of junk.