Where to buy DELL G5 5505 AC Power Adapter

I need to buy a new power adapter for my 5 year old DELL G5 5505. I tried on dell site and only found a 280W option ( Dell 280W 7.4mm AC Adapter) It is not the same as as 240W original. I found a lot cheaper on amazon but it was not sold by amazon, only ship from amazon ( 240W AC Charger Fit for Dell-G-Series G3 G5 G7 G15 3500 5500 7500 SE 5505 7700 5510 5511 5515 5520 5530 5521 5525 Ryzen Edition 15 17 P89F P105F P46E P100F Laptop Power Supply Adapter Cord ). I prefer buy from dell but it is not the same and pricier. Happy to read some opinios. Are there some problems with the cheaper options ?