1. Check out eBay. This is probably the largest shopping mall in the world. It has grown in leaps and bounds since its inception several years ago. Everything from tickets to sporting events to motor homes to baby blankets are sold on their site. They have lots of office furniture and it can be purchased at a more than reasonable price. For example, someone starts a business and it doesn't work out for them. They want to unload their office furniture that they don't need anymore and put it for sale on eBay. That is good for you. A new desk might cost you $1000, but you can get a slightly used one on eBay for $350.
2. Be practical. Don't get a desk that is more than you need. Buy one with plenty of surface area to write on, but, if you need several shelves or drawers, you might consider purchasing some filing cabinets or wooden bookcases instead of a large desk. The cost would be close to the same and you would most likely have more storage space.
3. Lease your office furniture. If you want the best quality and nicest looking furniture for your office, you might consider leasing or renting your furniture. You can enjoy the beauty of a brand new office with a lower up front cost. Do your homework and read all the fine print in the contract so that you don't end up paying more than you should in hidden fees. If you research thoroughly, you should be able to get a good deal and keep your cash flow in check while you get your office set up.