Best "Bang for the Buck" you have owned?

AR Turntable as I recall it was about $80, Dyna Mark III 60 watt power amps as a kit they were $80. I got two of them. The two used McIntosh 240 amps I got later, sounded a little better but cost about $400 each. I also bought two McIntosh 225s for a little less money. Phil Hale gave me a McIntosh 40 mono-block that I used for years on my "big foot" sub-woofer that I built. It is hard to beat free things. I got a new Linn Sondek from Britain's Audio T in 1977 for $250. I got a pair of Rogers LS3/5a speakers about the same time from the same source for $200 new. I still have them and they sound really good with the REL Stentor III subwoofer that I got for free from Rex.

The Sony HD Radio tuner I got new for under $100 is still in heavy use. Of course, Sony no longer makes these. They were going for about $500 on the used market last time I looked.

AR11 in the late '70s and then a custom speaker made by alternative audio in portland oregon called LGT (little great towers)

An Arcam FMJ integrated from about 10-15 years ago. I’m thinking it was the A18. Anyway, it really sounded great on vocals

Clearwave Audio Duet 6 Monitors. I paid $1000 for these speakers but once I received them one clearly had a bent grill which the driver would vibrate against at loud volume. The seller refunded me $200 and got me a replacement grill so I paid $800 for these.

They use Accuton ceramic drivers, top notch xover parts (mundorf, clarity caps, supra wiring, cardas solder, etc.), and a 2" baffle and rock solid cabinet. They retailed for $3k direct from Clearwave, but if sold through retail channels they would likely be $4-5k. I bought them on a whim driven by Covid-19 boredom/anxiety and once paired with dual REL T5i subs that I also got used they wound up replacing my Salk Song3’s which are now in another room. Total with the subs I paid less than $2k. No way I can do better at that price and based on the value alone I don’t think I’d ever sell them.