Here is a link to Speedway Motors (primarily a circle/oval track supplier)gussets -

http://www.speedwaymotors.com/race-c...irst_answer=17

They have the 1 1/2 x 1 1/2 or 1 3/4 x 1 3/4 gussets in a 25 pack for around $4.00 and the bigger 3"x4" (roughly) gussets in a 5 pack for around $6-7.

Cannot beat the price anywhere...Some of the gussets also have holes in them, some are solid. These gussets are available in town, but cost you upwards of $3 each.

There is also a slew of other interesting cross over products on this site, so take some time to check it out..