DID, EK, RK are well-established manufacturers.
X-Rings will run you north of $70.
O-Rings hover around $50-60.
The prices on "cheap" chains are often too good to be true and you can gauge that for yourself. However, researching the manufacturer will give you a better idea of the QC than the price they sell their products for (try Googling "Volar Motorsports" chains and see what you find).
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