Buying post supports as a bundle lowers the price per unit compared with buying each support singly. Because fencing and decking jobs need one support per post repeated across the whole run, a multi-buy pack cuts the total cost on projects that use several identical supports. The larger the pack, the greater the saving per support, so match the quantity to the number of posts you are fitting.

For a fence, choose a bundle of drive-in spikes or concrete-in supports sized to your fence-post section, and for a deck choose a bundle of bolt-down bases that fix onto a slab or footing. Match the support type to how the posts are anchored: driven or set in ground for fencing, surface-fixed for decking and pergolas. Then pick the pack quantity that covers every post in the run.

Most post support bundles contain supports of a single size so every post on a run is fitted identically. A pack sized for 70×70 mm posts holds only that dimension, while other packs suit 90×90 or 100×100 mm posts, keeping fit consistent across a fence or deck. If you need mixed sizes, check the pack description, as some sets are grouped by type rather than one uniform dimension.

Whether fixings are included depends on the support type and pack. Bolt-down bases often need masonry or coach bolts that may be supplied separately, while drive-in spikes and concrete-in supports usually need no extra fixings because the timber post sits directly in the collar. Check the pack detail, and for bolt-down types use fixings rated for outdoor and structural use.