I've got a friend (no, really) who owns an office equipment business. He has about 5 employees and has a recurring income of about $30-40k per month. If he sells more, he can make more, but that $30-40 comes from existing contracts.
Problem is: he wants to retire, but doesn't know how to sell the business. If he puts an ad in the paper, three things will happen:
1) his competitors will start hounding his customers and slowly eat away at them, and
2) his customers will probably get spooked, realizing he's closing and eventually move to competitors on their own
3) his employees will probably leave
The company is worth something. He's got a long history, with many original customers and a solid recurring revenue. How can he put the business up for sale without disclosing what the business is and scaring away his existing customers?
However afaik the business equipment / stationary world is a hard and low margin one, so I suggest your friend starts to prepare - clearing out small debts, tidying up paperwork, having a "sellers pack" prepared with all usual questions answered, reviewing employee contracts and pay scales, just house keeping in short.
Also it's worth looking to see if you can attract the attention of companies likely to acquire - do you have a local delivery or knowledge advantage? What major chains are sniffing round your existing clients - they alone would be worth talking to - always much nicer to buy a guaranteed contract than spent years on a sales force approach.