Script/Stylesheet to set shopping to default "low to high"

[slickrcbd]

My mother's TV just went kaput, and when trying to help her see who has any good sales on a new one using a computer and phone, I got annoyed that the e-commerce sites used by the local major retailers kept resetting the sort to "best sellers" instead of "low to high".
Thinking that I wasn't the only one to want it to default to "low to high" instead of "more expensive items first, deals several results in", I tried to google for a Greasemonkey or Stylus script/stylesheet to set the default.
I got no useful results.

Has anybody done such a script/stylesheet for sites like www.bestbuy.com, www.walmart.com, www.target.com, www.sears.com, www.abt.com and www.costco.com?

Sorry, I don't know where else to ask these days for something like this.