Ordered this from Bluefly...

This particular boston is a different shape - more like a tootsie roll. The bag you have listed with the strap (which I love btw!) looks like is only available in that medium size. I checked the UK Gucci website and they are calling that a "medium" joy top handle bag w/double handles and detachable shoulder strap.

They also have the regular joy boston bag (no detachable strap) with a similar color to what you posted called "light brown" but only on the UK site (not US).

http://www.gucci.com/uk/uk-english/uk/spring-summer-09/handbags/#0-850798-193603AH01G2535

You can try calling some of the dept stores: Nordstrom, NM, Saks, etc. I know that they sometimes get colors that the gucci boutiques in the US don't get.