Antique writing sets would most likely be found in antique shops, or possibly advertised for sale on eBay, or second-hand shops. Auction houses will also have antique writing sets for sale from time to time.
I inherited an antique tea set from my Grandma.
You can find antique chees knife sets on this site: http://www.worthpoint.com/worthopedia/antique-knife-set-brusletto-geilo-old-knife-set. They are gorgeous!
You may take photos of the patio set and take them to any antique dealer to request information. If you do not have a local antique dealer you may do a search on the manufacturer of the patio set to determine if it is indeed and antique. General rule of thumb on antiques are that in order to be classified as an antique it should be approximately 100 years old.
The best way to find out how much your antique crystal decanter set is worth, is by taking it to your nearest local antique dealer. They should be able to tell you how much it is worth and other information about the set.
No Lego set will be antique for a while. They were only starting to become available in 1949; And an antique is at least 100 years old. And please do remember, just because something is vintage or antique never means that they are exclusively valuable because of that!
There are a few different items that would be included in an antique desk set. One would be the chair that comes with the desk, and another is a desk cover.
silver service set from 1956 will be considered as collectibles. It is not old enough and not rare enough to qualify as antique.
One can buy a set of powered subwoofers from Best Buy, Sears, Walmart, and Fry's Electronics. A set of powered subwoofers can cost anywhere from $90 to $700.
One can buy a shower set at various retailers. One can buy a shower set at retail stores such as Target, Bed Bath and Beyond, Home Depot, Walmart, and Kmart.
Ebay, Amazon, Google Shopping, or a local Renaissance Faire all have the potential to have Medieval-themed chess sets for sale. For an actual chess set from the Medieval era, you may have luck at an antique store or pawn shop, though fakes could be common.
There are internet sites where one can find a tutorial on proposal writing. One such site is the Foundation Centre which has clearly set out guidance for many writing projects including proposal writing.
Unfortunately - there is no set price... it really depends on the piece you are looking at. I have included two links for your review... the first one is to an article that I wrote for about.com and explains the pricing of antique rugs and the second one is for general information about antique oriental rugs.