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The default list of common magic items is very short (and the PHB effectively has prices for 3 of the 4). My assumption has been that these are actually purchasable, unlike anything of a higher tier.
The Wayfinder's Guide to Eberron provides many more common magic items, but does not appear to list prices. Is there a source for this information somewhere?
Wayfinder's Guide to Eberron p. 46 has a section on "Creating Magic Items" with rules adapted from Xanathar's Guide to Everything and prices aligned with its "Buying a Magic Item" downtime activity. It suggests that House Cannith would be able to make many items at a much lower price, but common items look like they would be fairly priced at around 50 gp (probably more).
Xanathar's Guide to Everything p. 126 has the "Buying a Magic Item" downtime activity which is as far as I know the only way to buy magic items by RAW. The asking price for a Common magic item is listed as (1d6+1) x 10 gp, or half of that for a single-use item like a potion or a scroll. This isn't counting the 100 gp and one workweek of downtime spent finding a seller.
Normally there wouldn't be any guarantee that the particular item you're looking for will be for sale. To find a particular Common magic item your Charisma (Persuasion) check needs to beat a DC 10, with a +1 bonus for each additional workweek or 100 gp spent searching (up to a maximum bonus of +10). However, because Eberron is a high magic campaign XGtE suggests adding a +10 bonus to the check result which would mean that you can automatically find any given common magic item for sale.
Eberron: Rising form the Last War introduces rules for common magic item prices on page 281, Buying a Common Magic Item:
The DM sets the price of a common magic item or determines it randomly: 2d4 x 10 gp, or half as much for a consumable item such as a potion or scroll.
This means prices would vary from 20 to 80 gp for a common magic item, with a typical price of 50 gp.
The section also discusses rules for items being available or not:
In Eberron, common magic items can be found for sale in most communities. The DM determines the stock that is available, or the DM has the shoppers make a group Intelligence (Investigation) check to find a shop or ped- dler that has the desired item in stock. The DC for this check is 10 in a city, 15 in a town, and 20 in a village. If the check fails, at least 24 hours must pass before looking for the same item in that community.
