Don't know why the price difference.
S&S is a great place for many items for re-enactors. Generally fast shipment and fair prices, plus a selection of products not found elseware. A price difference might be because they have no stock of the item ... and generally Cabela's can tell you if the item is availablble for immediate shipment. I'd call/email S&S to ask if the item is in stock and available for immediate shipment.
Cabela's is also a great place, but many local stores do not have/use internet pricing, and there can be a time-consuming wait while the local store checks and meets the internet price. They will, but it takes a department manager approval and some paperwork to check-out at the lower internet price.
Don't expect a speedy check-out!
PS: I hope Cabelas monitors this site!
