Welcome.
I think the dude meant ohms not amps.
But yes he is correct. You don't really need all 300 watt amp. Anything in between would be just fine. A 1 to 4 ohm stable amp would be geat.
Keep in mind that a duel voice coil sub has to be wired just right. Since yours is 2 ohm you can run it at 1 ohm at parallel hook up and squeeze ever ounce of wattage from the amp or run a conservative 4 ohm with a series wiring hook up.
And yes you don't want a big amp say 500 RMS watts, running into your 300 watt sub. You'll fry it really quick.
If you have doubts just YouTube it.
As far as amps, now a days you can get a decent one from Walmart or a better one from Best Buy.
A quick google-fu I found this little bad boy. It's a class D mono block amp for $120 from Walmart.
https://www.walmart.com/ip/Pioneer-G...o-Amp/26973193