This should do -> http://shopping.rcmodel.hk/product_i...oducts_id=5050
I think you can find them almost in any HS. But if you are going to make the PSU yourself, I think you can also make something up for splitting and save a few bucks
To hold just 1 charger, 300W PSU will be more than enough, if you have 2 chargers, 400W should be fine. Look at the brands, I would recommend FSP or HEC, imho the best quality/price comparsion.