These costs are admittedly beyond our $100 budget, so consider whether you really need them before signing a contract. With so much business conducted online and via phone, you may never deal with visitors at all.
For a Little More: Offload Fulfilment and Shipping
Selling physical goods online often means long hours spent in your garage packing up orders to ship to buyers, and then standing in long lines at the post office to mail it all off. Another option exists, thanks to the wonders of e-fulfillment: You pay someone else to do all the inventory handling and order shipping for you. Fees can be pricey unless you have the volume to mandate it: Efulfillment Service costs $70 a month flat, along with $1.85 per order processed and $0.25 per cubic foot per month for inventory stored, plus actual shipping fees.
Alternatively, you could hire a student or other temporary help to do the work for you a few days a week, but you'll still have to find somewhere else to park your car.
By now your business should be up and running--but that, alas, was the easy part. Now get out there and publish, promote, and sell, sell, sell. And remember that even if, in the worst case, your business fails, "CEO" always looks good on your resume!