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.
BRITISH WWII KOREAN ERA MARK IV STEEL HELMET W LINER CHIN STRAP GOOD COND
Time Remaining: 1d 7h 27m
WWII British Brodie Helmet Elastic Chinstrap 02
Time Remaining: 7d 20h 40m
Buy It Now for only: $19.95
WWII British Tommy Mk II Brodie Helmet Complete w Liner Chin Strap Dated 1939
Time Remaining: 29d 13h 39m
Buy It Now for only: $126.99
Kings Toys 1 6 WWII RAF British Pilot Type C Flying Helmet
$9.99 (1 Bid)
Time Remaining: 1d 15h 59m
Original WWII British Brodie Steel Helmet in OD Green WW2 Dated
Time Remaining: 28d 23h 17m
Buy It Now for only: $79.95
WWII British Tommy Helmet Chin Strap SOLD INDIVIDUALLY
Time Remaining: 21d 15h 55m
Buy It Now for only: $5.00
JAPANESE FIREFIGHTER BADGE TOKYO JAPAN FIRE CHIEF POST WW2 FIREMAN VTG FD HAT
$1.25 (2 Bids)
Time Remaining: 1d 18h 39m
British WWII Brodie Helmet Replacement Liner Size 7 1 4 58 cm
Time Remaining: 6d 16h 27m
Buy It Now for only: $34.95
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