It’s cheaper to buy backlinks than to buy Google Adwords. Naturally, for paid links, you’ll pay a higher fee if you want to buy high-value backlinks than when you want to buy a link with low Domain authority and PA value. This is simple arithmetic; a website with a high DA and PA value, the more relevance and value the paid links will have. No matter how tight your budget is, you should never attempt to engage in black hat practices or buy low-quality links. They may work initially, but in the long run, they attract penalties from Google. The only right way is to spend your money on high-quality links so that you can rank higher in Google search engines.