You will have to get Very Lucky to replace your lost scanner for $30.
I wouldn't even try.
Universal Radio has a good selection of scanners.
Check their online catalog to get an idea of what you can get for what price.
I own:
Uniden Bearcat BCT15X tabletop / mobile [900 MHz capable] ...Paid $220 / new in 2011
Radio Shack Pro-95 portable (made by GRE) [900 MHz capable] ...Paid $200 / new in 2004
Radio Shack Pro-404 portable (made by GRE); currently available as Whistler WS-1010 ...Paid $4 / used in 2013
Radio Shack Pro-38 portable [1988 10-channel programmable] (made by Uniden) ...Paid $1 / used in 2003
Try looking for a used one at garage and estate sales and thrift stores,
and Make Sure It Works Before You Buy It.
Sad story:
Years ago, I bought a Uniden table / mobile at an estate sale for $20.
Yes, I tried it out first, and it worked.
In fact, it was plugged in and operating when I first saw it.
The box and all the other original stuff were there.
So I shut it off, packed it all up, and thought I'd gotten a good deal.
Well, when I set it up later that evening,
it lit up but the display was blank and it wouldn't do anything but hiss.
Guess what?
It was no longer supported by Uniden.
No paperwork of any kind available,
no idea who might be able to make it work.
So, be Very careful and Really check out anything used that you run across.