The MegaRay is the best MVB out there!
http://www.reptileuv.com/megaray-products.php


As for getting crickets online, you'll want to find the place closest to you so that shipping is cheaper. Here are a few places I've worked with that have great reviews.
http://www.flukerfarms.com/
http://www.ghann.com/
http://www.mulberryfarms.com/
http://armstrongcrickets.com/shop/

Those are the few that come to mind, I'm sure there are more I have forgotten.