Hi there!
You can try multiport PoE switch. We use RAYON FPI400, 4 ports/15.4W each - it cost like $100.
For bigger systems, the best solution, in my opinon, is Cisco SD or SRW PoE switch (SD208P, SRW208P, SRW208MP, SRW224G4P...). They are not cheap but they are the best solution on the market.