British war helmets from WWII are little cheaper than those of WWI according to my research on all completed sales on eBay on the last 90 days. WWII helmets are traded every single day with minimum of 10 bids, which means there are great number of engaged buyers and sellers. You can expect to pay anywhere between $50 - $300 for a helmet based on condition & rarity.
If you are looking to buy a British helmet, you will have to join the bidding war. For example, on September 12, 2010, a WWII British helmet was sold for $267.88 with 24 bids. Take a look at the helmet on the right. It is not in great shape, but still goes for high price because of its rarity.
eBay is indeed the best place for searching WWII British helmets for sale from various sellers and collectors. I don't think there's any other place like it. Below are some of the listing from eBay. Browse the the listing and click on a link which you are interested in. You will be taken to a page with more information on the helmet.
Original WWII British Brodie Steel Helmet w liner and chinstrap
Time Remaining: 6d 19m
Buy It Now for only: $34.99
1943 DATED WWII BRITISH TOMMY HELMET GRAY PAINT w LINER CHINSTRAP
$31.00 (8 Bids)
Time Remaining: 2h 45m
Original WWII British Brodie Steel Helmet in OD Green WW2 Dated
Time Remaining: 12d 6h 10m
Buy It Now for only: $79.95
British WWII Brodie Helmet Replacement Liner Size 7 5 8 61 cm
Time Remaining: 13d 16h 40m
Buy It Now for only: $34.95
WWII 1941 British Civil Defense Military Helmet Constable White
Time Remaining: 27d 18h 57m
Buy It Now for only: $39.99
WWII British Canadian Australian South African helmet chinstrap for parts
Time Remaining: 2d 3h 43m
British WWII Paratrooper Steel Helmet
Time Remaining: 19h 7m
Buy It Now for only: $94.95
Original WWII British Brodie Steel Helmet in Black WW2 Dated 1940 W Liner
Time Remaining: 10d 15h 23m
Buy It Now for only: $69.95
Here is a list of previously sold British helmets on eBay. Use this as a guide so that you don't pay too much for a helmet in the future.
- Dispatch Rider Helmet 1945 - MINT : $200
- Paratrooper Helmet - REPRODUCTION : $157.50
- Tommy Helmet - 1942 - GOOD : $142.50
- Tommy Helmet - 1942 - GOOD : $79 (notice the difference in price. I checked the auctions and both are almost in same condition. If you shop, you can still buy the helmets for cheap)
- Motorcycle Helmet - 1945 - GOOD : $112.50