I was thinking of trying out some omniwheels, and I found these at good pricing:http://www.robotshop.com/ProductSearch.aspx?qs=omni+wheel
The 'Dagu' wheels seem to fit the bill price-wise and in terms of size of what I was thinking. Thing is, they all have these funky hex openings, and no real way to connect them. I was planning on using some simple servos, such as ROB-09347 from Sparkfun. Thing is, I'm not sure how I could mount these wheels - I was hoping somebody might have run into something similar and have an idea of something that won't just fall apart in the first half hour.
Also, if anybody has had luck with another omni wheel elsewhere, would love to hear about that and give it a look.
Haven't been able to find any good omniwheels elsewhere - there's the 'transwheel' thing that seems to be available via ebay and nowhere else, but they just look very shoddy in terms of construction. There's also mecanum wheels, which certainly have their benefits - but the price is higher than what I was hoping to spend.