Actually that doesn't sound too bad depending on the situation and rates I would consider it. Are they asking 30% of the purchase and all repairs out of your pocket or 30% of the ARV?
At a decent rate I would do a 70% of ARV loan all day...that would give me effectively 100% financing in some situations, especially REO fixers.
If it's 30% of purchase, that's not necessarily the best you can do but in this environment I think it's worth consideration while you continue to look.
Hate to say it, but generally you need to have skin in the game though. It makes me more careful at least. It depends on what you have to work with and what you're specifically trying to do.