Betfair Sportsbook will display their price boosts on their homepage usually on their main advertising banner but also on the right-hand side of the sports homepage entitled 'Odds Boost':
Betfair have regular boosted/special football odds which you can find here. These can be in the form of enhanced accas. You can find some custom acca lay markets on Matchbook or create your own accumulator lay market with the Smarkets acca feature.
Betfair also have odds boost tokens which allow you to get boosted odds on a selection of your choice.