where can i find a used wooden picnic table for under $300.00?

Dear Skootie, 

eBay is a good place to start looking for such products: 
eBay
<http://www.ebay.com>

In addition, people sometimes post such things in local newspapers, or
on Craiglist:
CraigList
<http://www.craigslist.org/> 

Finally, there are more than few wooden picnic tables listed on
Froogle for under $300:
Froogle - Search for wooden picnic table
<http://froogle.google.com/froogle?q=wooden+picnic+table&hl=en&lr=&tab=wf&scoring=p&cat=772>

I hope this answers your question. Please contact me if you need any
clarification on this answer before you rate it.

You might want to add a city and state to your request --- also if you
need delivery or not.....

Preferably within California and preferably in the Santa Cruz area.