Also false. There's stuff still in stock, usually.
Not for cheap.
By 100$, you're ~20$ away from the mid-rangers, entry level is the 50~100$ range.
... Do you know what the product stack looks like in a modern context?
Display Adapters
RX550/GT1030=~65-85$ Don't buy these. If you have to, the RX550 is about 10% faster than the 1030. The 1050 and RX560 are twice as fast for less than twice as expensive. Just don't.
Entry Level:
1050/RX560=~100$ MSRP, these are the lowest end things anyone should buy
1050ti=~125-150$ Best performer for 75w power draw, otherwise don't buy it. Still entry level, only around 15% faster than the above two at best
Limbo(aka, I don't know how the fuck to classify this)
RX570/GTX 1060 3 gig=~175-210$ Prices vary wildly on these parts, about 10-15% slower than the next tier up for about that much less expensive. Better buys than the 1050ti by a long shot.
Mid Range:
RX 580/1060 6gig=~200-300$ Solidly mid range GPUs, right in the center of the current product stacks. RX580 is usually the cheaper of the two and is faster, get the 8 gig version if possible.
RX 590=275-350$(rumored pricing, very rumored) Should be about 12-15% faster than the RX580, possibly 20% faster than the GTX 1060 6 gig on average, price reflects this. We think. Same power draw as an RX 580(should be anyway), so a good upgrade from it if you don't want to spend more(when the thing finally fucking launches)
High End
Rx Vega 56/GTX 1070=~400-450$ Very good cards, suitable for 1440p high refresh rate gaming and some 4k gaming if you want to turn down quality settings. The Vega here is about 5% faster on average than the 1070 and, when overclocked, matches the highest end AMD GPU.
GTX 1070ti=~450-500$ Literally the next tier up when overclocked, otherwise about 7% faster than the 1070.
RX Vega 64/GTX 1080/RTX 2070=~500-600$ Perfectly suited to 1440p high refresh rate gaming. They all perform within 5% of each other with very little pattern on which is the fastest card, if it's cheaper than the other 2 get the RTX 2070, it is more future proof than the 1080 and pulls less power than the Vega64. Don't get any of them if a Vega56 or a GTX 1070ti are available and cheaper, just buy and overclock those and you get comparable performance.
Enthusiast
1080ti=Fuck if I know. It used to be the cheapest out of these GPUs at 600-700$ but now stock has vanished and the cheapest ones are well above that price now
2080=~700-950$ If it's 700$ then it can be worth it, otherwise don't fucking bother. It's as fast as a 1080ti which is 35% faster than a gtx 1080 for way more than 35% more expensive. Can do 4k fairly well without anti-aliasing though.
2080ti=1200-1400$ Fastest GPU on the planet, can easily do 4k 60fps in the majority of games in existence. Fucking expensive though.