I looked this up and it appears the A2000 launch price was $1495 USD in March 1987, I don't know the UK price but it would've been around £950 at the time. That's ridiculously cheap (until you understand it's an A500 with Zorro and ISA slots). The A3000, probably the best machine Commodore ever made, launched for $3379 USD in 1990.
I don't have any magazines from 1987, but Amiga Format issue 1 (August 1989) has an advertiser selling:
A2000 standalone £799
A2000 with 1084s monitor and XT bridgeboard £1099
A2000 with 1084s monitor and XT bridgeboard and A2090a (HDD controller card for the A2000 because IDE hasn't been invented yet) with 20MB HDD £1369
A2090a with 20MB HDD £479
A2090a with 40MB HDD £750
A2058 (up to 8MB RAM expansion) with 2MB RAM populated £449
I can see why you'd offer a working system, 1MB RAM, floppies only, if it more than halved the visible price.
Amiga 600 standalone: £194.99
Amiga 1200 standalone: £289.99
20MB HDD £89.99
60MB HDD £179.99
80MB HDD £195.99
120MB HDD £219.99
210MB HDD £359.99
Amiga 600 with 20MB HDD £289.99
Amiga 1200 with 85MB HDD £499.99
Amiga 4000/030 with 120MB HDD £969.99
Amiga 4000/040 with 4MB Fast RAM and 120MB HDD £1699.99
RTC fix: £14.99
Commodore 10884ST monitor (requires interlace for 640x512) £199.99
Commodore 1940 monitor (640x512 without interlacing) £284.99
You can see how the prices add up very quickly and make things unaffordable for the typical family. A business could afford to pay £1300 per computer, but a family likely could not. Most people plugged their machine into their existing TVs, as it seems did you.
If anything, this gives a good example of how technology has beaten inflation. The 20MB HDD is £4.50 per megabyte, or £4.7 million per terabyte. Today you can get a 16TB drive for £215, or £13.44 per terabyte, which is 351,000 times cheaper