True most AC adaptors currently on offer probably won't be switching type, although there have been times when a number were. However, I know the one marked as such, 40812 which is 12 VDC
upto 2 A, is an actual switching power supply for $7.95. There's also an inline switching AC adaptor
with the same ratings, for the same price.
There are also some larger regulated or switching power supplies
(the first three listed on the linked page). An upto 2 A power supply with six voltage levels from 3 VDC
to 12 VDC
, that I use in my workshop (the 7.5 VDC
setting works well with Arduinos). A 12 VDC
4.16 A rated switching power supply on clearance for only $10.00. Although it does need an IEC-60320-C7 cord
, but those aren't too hard to get. Finally there's a 12 VDC
switching power supply that can supply a maximum of 4 A with four pre-made cables. It's a little different in that the connections are configured as four distinct outputs each limited to up 1 A, but they of course can be tied together on a terminal strip or what have you.
I've been patronizing this store since I was a kid. Although not primarily for electronics; mostly for laboratory equipment, hand tools, miltary surplus, and just interesting and unusual stuff. While the product descriptions can be quirky and pun-laden, they are truthful about what they sell including being up-front about defects that caused a given item to be surplused. Also note, some of their inventory isn't surplus but those prices tend to be competative as well.