One of my biggest pet peeves is when I am on a location shoot and can not find the lens cap after i'm done shooting. I've lost them countless number of times in various locations, but can never seem to find them again. One of the best parts abou Ebay is that you can find direct low cost alternatives to many things. Lens caps can be affordable if you know where to look. I've ordered 10 lens caps to keep at the studio at all times just so I have a lens cap when and where I need it. Here are some readily available lens caps for cheap:

Underwater Housing Case for Samsung L830,S500,S600,S630    US $37.95

Underwater Housing Case Samsung L55W,L73,L74,L700,L730    US $37.95

Waterproof Housing Case Samsung L55W,L73,L74,L700,L730    US $37.95

Water/Dust/Sand Case for Samsung L55W,L73,L74,L700,L730    US $37.95

Water/Dust/Sand Proof Case Samsung X1,X15,X60,Q25,L50    US $37.95

Waterproof Housing Case for Samsung X1,X15,X60,Q25,L50    US $37.95

72 mm Flower/Petal Lens Hood L1F for Nikon Canon Tamron    US $4.99

Underwater Housing Case for Samsung X1,X15,X60,Q25,L50    US $37.95

Water/Dust/Sand Proof Case Samsung U-CA3,CA4,CA5,Q1,Q2    US $37.95

Waterproof Housing Case for Samsung U-CA3,CA4,CA5,Q1,Q2    US $37.95

Underwater Housing Case for Samsung U-CA3,CA4,CA5,Q1,Q2    US $37.95

Water/Dust/Sand Proof Case Pentax E10,E20,E40,E50,V10    US $37.95

Waterproof Housing Case for Pentax E10,E20,E40,E50,V10    US $37.95

Underwater Housing Case for Pentax E10,E20,E40,E50,V10    US $37.95

Water/Dust/Sand Proof Case Pentax M10,M20,M30,M40,M50    US $37.95

Waterproof Housing Case for Pentax M10,M20,M30,M40,M50    US $37.95

Underwater Housing Case for Pentax M10,M20,M30,M40,M50    US $37.95

Water/Dust/Sand Proof Case Bag for Panasonic LZ10K,LZ7S    US $37.95

Nikon 28-80mm f/3.5-5.6 AF-D Nikkor 28-80 Lens +UV Mint    US $109.00

Waterproof Housing Case Pack for Panasonic LZ10K,LZ7S    US $37.95