I have a little graphic piece on my computer so I can print off a small handful of business cards for a specific shop I do every couple of years that requires I purchase a "business membership". I have several small free bank accounts around that were established for the purpose of doing shops and function as my "shopping slush" fund as I deposit checks from them into my main account to pay the credit cards. I use my personal credit cards for my 'business' and collect the cash back and points for my personal use.
My perks are that my business buys me new equipment. I would not have a cell phone except I need it for work, so work pays for it. IRS will not allow you to deduct your first land line phone, but the cell phone does legitimately deduct. When it is time for a new computer or laptop, my business buys it. There is an excellent SLR digital camera in the house, the other one I bought to use for MSing is a deductible perk. Software, computer accessories and such are generally shop related so are deductible perks.
But of course the best perks of all are reimbursement for things I would buy anyway--oil changes, groceries, eating out, the occasional movie, etc.