HTTP Flood attack, low bandwidth

Hello,

My server is currently being attacked by HTTP flood attack. It comes from distribution of spoofed IPs. My X-Peak Watchguard was doing well but the problem is the attacked had consumed a lot of bandwidth and still my website becomes inaccessible. I have subscribed for only 30MB instead the attacked was consumed in range of 100MB-150MB.

My question is :-

1. Since the ISP can't do anything to help me for at least route bad traffic to the blackhole, if there any hardware could block SYN attack and in the same time save my bandwidth instead of preventing from upstream provider?

2. I'm thinking to try using the Ddos mitigation services that provide proxy IP. Which one has provided competitive prices & good support instead of Prolexic (this one is absolutely under my budget)? Provider from East Asia region is much preferred.

Thanks for GOOD answers.