Finnair Plus sells its points at a bonus couple of times per year and currently has up to 40% bonus for buying points through February 11, 2018.
The sweet spot of Finnair’s award chart are the short-haul upgrades from Economy to Business class (Dubai and Tel Aviv are both considered short-haul) that are priced at 10,000 points (sometimes even these are discounted).
You can access Finnair’s page for buying points here.
Here’s the bonus schedule:
And here’s the price if you buy the maximum:
The price is 0.92 euro cents each.
I would only buy Finnair Plus points if I would be 100% sure to be able to use them for these short-haul upgrades where they are good value compared to paid upgrade prices or paying for business class outright.
Finnair Plus does occasionally sell points at up to 50% bonus. You can get better deal if you can wait better offer to surface.
Here are the the terms and conditions of this offer:
Transactions must be completed between 15 January (00:00:01 EEST) and 11 February (23:59:59 EEST), 2018 to receive the Finnair Plus Points bonus. Bonus Finnair Plus Points will be awarded to the recipient. All other Buy/Gift Finnair Plus Points terms and conditions apply.