I usually collect several soundsets into one bundle.

Buying a bundle of presets is more beneficial than getting a single soundset. 

The list of Bundles:

Moog Grandmother Bundle - 120 Presets

Moog Matriarch Bundle - 150 Presets

Moog Subsequent 37/Sub 37 MONO Bundle - 128 Presets

Moog Subsequent 37/Sub 37 RHYTHMIC Bundle - 192 Presets

Moog Subsequent 37/Sub 37 COMPLETE Bundle - 384 Presets

Moog Sound Studio Bundle - 150 Presets

Moog Subsequent 25/Sub Phatty Bundle - 128 Presets

Novation Peak Bundle - 214 Presets

ASM Hydrasynth Bundle - 256 Presets

Arturia Minifreak Complete Bundle - 488 Presets

Arturia Minifreak Rhythmic Bundle - 128 Presets

Arturia Minifreak Poly Bundle - 128 Presets

Arturia Minifreak Mono Bundle - 128 Presets

Arturia Microfreak Bundle - 170 Presets

Arturia Matrixbrute Bundle - 128 Presets

Korg Minilogue XD Bundle - 215 Presets

Korg Opsix Bundle - 250 Presets

Korg Wavestate Atmospheric Bundle - 200 Presets

Korg Wavestate Rhythmic Bundle - 100 Presets

Korg Wavestate Complete Bundle - 400 Presets

Korg Wavestate Era Bundle - 100 Presets

Korg Modwave Bundle - 200 Presets

Behringer Crave Bundle - 65 Patches + 148 Sequences

Behringer TD-3 Bundle - 448 Patterns

Behringer Pro-800 Bundle - 250 Presets

Behringer Kobol Expander - 100 Presets

MIDI Patterns Acid/303-Style Bundle - 448 Patterns

Elektron Digitone Bundle - 192 Presets

Elektron Analog Four Bundle - 192 Presets

Elektron Syntakt Bundle - 128 Presets

Dreadbox Typhon Bundle - 128 Presets + Sequences

Dreadbox Nymphes - 98 Presets

Synapse Audio Legend HZ - 150 Presets