I don't know if this will fit your needs, but Amazon.com has a great sewing cabinet on casters. I just bought mine in September and I love it. Here is the link. It comes in two finished a 'cherry finish', which is really more espresso in person and a 'pine finish'. The two vary by about $20.00 but it is nice and sturdy, took me (alone) around 2 1/2 hours to put together. I love mine and it was around $150.00 delivered. Has a nice left table top that extends, plenty of right size storage and under cabinet storage for a sewing machine.
http://www.amazon.com/s/ref=sr_1_2_a...023&sr=8-2-acs
Hope this helps!