The stores listed in the env file are rotated through for checking, and the info output shows the various tools.
It appears that only two stores are appropriately rotated.
OS:
Ubuntu 20.04 under WSL
.env file:
(I removed non-set values)
DISCORD_WEB_HOOK="https://discord.com/api/webhooks/blah"
SHOW_ONLY_BRANDS="amd,asus,corsair,gigabyte,msi,powercolor,sapphire"
SHOW_ONLY_SERIES="rx6800xt,rx6900xt"
STORES="amazon,amd,bandh,bestbuy,newegg"
[11:03:13 AM] info :: ℹ [amd] Next proxy index: 0 / Count: 4
[11:03:14 AM] error :: ✖ [bestbuy] msi rx6800xt amd reference - net::ERR_FAILED at https://www.bestbuy.com/site/msi-radeon-rx-6800-xt-16g-16gb-gddr6-pci-express-4-0-graphics-card-black-black/6440913.p?skuId=6440913
[11:03:19 AM] error :: ✖ [amd] amd rx6800xt amd reference - net::ERR_FAILED at https://www.amd.com/en/direct-buy/5458372800/us
[11:03:19 AM] info :: ℹ [bestbuy] Next proxy index: 0 / Count: 4
[11:03:23 AM] error :: ✖ [bestbuy] msi rx6800xt amd reference - net::ERR_FAILED at https://www.bestbuy.com/site/msi-radeon-rx-6800-xt-16g-16gb-gddr6-pci-express-4-0-graphics-card-black-black/6440913.p?skuId=6440913
[11:03:28 AM] info :: ℹ [amd] Next proxy index: 1 / Count: 4
[11:03:33 AM] info :: ℹ [bestbuy] Next proxy index: 1 / Count: 4
[11:03:33 AM] error :: ✖ [amd] amd rx6900xt amd reference - net::ERR_FAILED at https://www.amd.com/en/direct-buy/5458372200/us
Unfortunately, I can't replicate:

bandh doesn't have any rx6800xt models.
I'll see if I can get it to reproduce. I probably mucked something up with the proxy config. Closing for now.
I started seeing this with the recent release- but only from newegg.
Doing some digging and this started on this commit for me: 64898b8ae355b0112ee507630ec3224b71f1eff9
If I can pin it down to something useful I'll open a new ticket for it.
Currently running node v14.15.2
Also running with global.proxies setup, env is as follows:
USER_AGENT="Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36"
MAX_PRICE_SERIES_RX6800XT=850
MAX_PRICE_SERIES_RX6900XT=1200
OPEN_BROWSER=
PAGE_BACKOFF_MIN=900000
PAGE_BACKOFF_MAX=1800000
PAGE_SLEEP_MIN=
PAGE_SLEEP_MAX=
PAGE_TIMEOUT=30000
SCREENSHOT=
SHOW_ONLY_BRANDS=
SHOW_ONLY_MODELS=
SHOW_ONLY_SERIES=ryzen5600,rx6800xt,rx6900xt,3080
STORES=amazon:60000:90000,amd,asus,bandh:300000:600000,bestbuy,newegg,target,walmart,zotac
Also probably worth noting I am running WSL2 with Ubuntu also
Keep me updated. If this continues to be a problem, I can look further into it.
I made a new issue for it here: https://github.com/jef/streetmerchant/issues/1437