I do not know your budget, but last year my husband and I purchased a glass top table and four chairs from the Martha Stewart collection from Kmart for $199.00. Check out their ads weekly. When we were checking out prices on the umbrella's we found that they were half the price of the entire table/chair set ,so we decided to go to Ollies (don't know if you have one near you) here is a link to their website:
http://www.olliesbargainoutlet.com/index.php
anyway, we found the exact same umbrella that we saw at Kmart for $75.00 for half price at Ollies. So... for under $250.00 we got a very nice table, 4 chairs and an umbrella. I think watching Kmart's ads will be your best bet. I would also suggest Biglots if you have one nearby:
http://biglots.com/
Good Luck!!
Cheryl