How much would someone pay to buy my promotional products distributorship business?

I have over 400 customers from all over the U.S. that bought online or
over the phone.  99% of my business comes from the internet.  I don't
advertise locally.

Here is some financial data:

Total income:
2003 - 112,893.46
2004 - 129,660.00
YTD 2005 - 114,057.37

Cost of Goods Sold:
2003 - 73,226.47
2004 - 65,105.44
YTD 2005 - 77,212.55

Gross Profit:
2003 - 39,666.99
2004 - 63,757.16
YTD 2005 - 35,649.35

Total Expense:
2003 - 27,723.88
2004 - 40,793.45 - (includes $15,000 of payroll to myself).
YTD 2005 - 22,454.40

Net Income:
2003 - 12,230.88
2004 - 23,248.71
YTD 2005 - 14,037.53

The value of a business is normally judged at 8-10 times the annual
net profit figure. So in your case about 140,000 dollars I presume.