Hi,
I use Monitor gold (?) model from sound foundations. They are well constructed in steel, Have spikes, look good and are shipped to your home. The central column can be filled with sand or Atabites for additional weight.
Besides helping my LS50 sound good, they are very useful in moving them around for finding the best position.
Khuzema Ali Tajir of sound foundations is efficient in answering queries and arranging shipment.
SF also has other models/designs on their website. (Disclaimer: I don’t profit in anyway from their sale)
I have also used in the past, cement blocks stacked up as stands. They do well, but are difficult to move for positioning and are aesthetically less appealing. Covering them artfully with some fabric helps.
...long term, stands are worth the investment I feel, specially with good quality bookshelves.