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You can buy HP delegations from Ecency. That's mostly their usage.

Where is that option in Ecency to buy HP delegation? Do you mean to say Boost?

Yep. When you Boost your account that's what you're doing, buying an HP delegation.

Boost just gets you a nice upvote from ecency trail.

Mmm, what do you mean with "boost"?

In the Ecency's main page you can see a blue flame in the top right corner. If you tao there, you have the Boost+ option where you can buy an HP delegation from Ecency. You can buy it for 7, 30 or 90 days using Ecency Points.

Oh! Now I get it. How much HP I can buy with different denominations of points spent?

It's always around 200 HP. What changes is the time you stay with the delegation.