For Amazon products, simply link to the ASIN, like this:
For MicroCenter products, precede the 6-digit SKU with "MC", like this:
You can also search for a UPC at MicroCenter:
To look up a UPC, you can link directly to the 12-digit UPC:
Be advised: this utility does absolutely no validation of input whatsoever. Invalid products that match the regular expression for a valid product identifier will be passed through unchanged, likely resulting in a link leading to an error page. Accordingly, users should take care to validate their inputs before creating the links themselves.