Agh! I had a stash of SPS plates/pillars bought up and I am out.  I realized it a few weeks ago that I wasn't going to have what I needed for my 12", 10", 8" & 6" wedding cake for this weekend.  I could not find anyone that sold SPS plates by searching online, so had to break down and purchase a different kind of stacking plate system off of Amazon (I found singular 6" SPS plates on Amazon, but no pillars and no different size plates).  I used to buy these from GSA (Global Sugar Art), but now that he's closed I am unable to find them elsewhere.  I thought they were made my Bakery Crafts and have searched in vain looking for a way to buy them.  Anyone know who/where I can get these from?  I only use them for cakes 3-tiers or larger, so I don't use a ton of these.  I am used to them... *sigh*. If they aren't made anymore - can anyone direct me to what they use instead?  The set I got off of Amazon worked in a pinch for today but I had to use melted candy melts to "glue" the cardboard to the smooth plate.... it didn't have the little "nub" to lock the cardboard in place and I didn't want the cake to shift.  No great directions with the set I bought off of Amazon (of course), so I had to improvise with candy melts.  HELP!!!

Have you tried hobby lobby or Michaels? Seems I saw some at one of those stores in the past few months.  Or have you tried eBay or similar sites?  Most likely if any are offered they will be yellowed.  

if they are yellowed, one idea to work around that is to brush them with beaten egg white and sprinkle with granulated sugar to conceal -- they will glisten prettily but they will be white -- 

That idea K8 is probably the only one that will work.  Over the years I tried many different things others suggested but none really worked very well.  

I believe you are talking about the SPS stacking system and not decorative pillar separators?  If so, I've never used them.  For cakes with more than three tiers, I deliver in sections of two tiers each and finish assembling at the venue.  I transport each section in it's own homemade cooler and it works beautifully and assembly is very easy.

https://artisincakes.com/products/stacked-cake-round-separator-plate-sps-single-plate-system-with-secure-column-attachment?variant=44661077129

Here you go, the SPS system is sold by Art in the Cakes.  This page shows the separator plates, but down at the very bottom of the page is a link to order the posts that go with them.

I always liked the 3/4" plastic tube type dowels -- I actually used a variety of different pillars even in the same cake -- 

I love them too.  I've tried a hundred different ways to stack and those worked the best for me.  I bought a ton from GSA before they closed and used to be able to get them from Oasis, but now they carry another brand.  

Thanks, Sandra, I'm going to check that source.  I picked some up recently from DecoPac and I just checked.  It looks like they have some in stock.