Givi (#TN392) &
Renntec (REN10084B & REN10084C) make guards for the Bandit 600. IMHO, these are better than the Suzuki ones.
Are the ebay ones new or used? I thought the Suzuki ones were only available thru Suzuki dealers. Probably the cheapest dealer source for them is Ron Ayers... or at least compare Ron's price ($94.18 for the B12 ones - which is all that's currently available, but are the same as the B6 ones except they're black instead of silver) to the ebay prices.
There's no pic on the Givi site for the B6, but they look like their B12's guards - and come black:
The Renntec guards look like the Givi guards, but come in black or chrome. (They have a B12 version, too.)
Holeshot also makes guards, but only for the B12.