A quick check on our
B&H link showed me the following:
Kodak D-76 (packet to make 1 gallon stock) - $5.79
Ilford Rapid Fix 500 ml (liquid for film or paper) - $6.25
Paterson Universal tank with reel - $22.96
Head to someplace like a discount mart for a couple of cheap plastic measuring cups, and the can opener - should all be less than $10-15. Check their pharmacy area for plain opaque jugs - or try cleaned, opaque milk jugs with screw caps.

Not pretty, but servicable.
If you think you want a funnel, buy it at the discount store, too.
A thermometer is a nice thing to have, but not particularly crucial. Make sure the tap water feels tepid to your fingers and you're right there - not especially warm, and not icy. If you err, err on the cool side. The film will forgive you the coolness, it will not forgive you heat!
Okay, this is kind of basic, but really this is all you have to do:
Load film onto reel in total darkness. Sitting on the closet floor is comfortable - no light leaks!! (practice with the reel and used film in the daylight several times until you get the hang of it) Put the loaded reel into the tank, close it up tight. Proceed to kitchen sink. Have the developer pre-measured in one cup, the fix in the other.
You can pre-soak the film in plain tap water for about a minute, then dump.
From one of the measuring cups, pour in the D-76 straight into the tank – the timing depends on the film type/speed – there will be a chart, or someone here can tell you how long, and how often to agitate (by inversion). Stand at the sink and watch the clock.
Once the time is up, dump the developer and use plain running water as a stop bath for a couple of minutes.
From the other measuring cup, pour in the Ilford fixer, agitate as you did for the film, then dump (you could actually save it and re-use it, checking its freshness periodically if you buy a hypo-checking agent and an extra container for used fix - like a clean quart-sized opaque milk jug).
According to Ilford literature, there is little need for a hypo clearing agent for film, so you are spared this cost and step, provided you wash well. I can look up the recommended archival wash verbatim from Ilford if you want.
After the wash, carefully remove and hang the film strip with clothespins and suspend in as dust-free an environment as you can find – a closed closet is excellent.
Sit and have yourself your favorite beer – you can now afford more beer with the money you’ll save forever, having taught yourself how to develop film at home. :cheer: