Hey dominator,
Thanks for your reply 
.
I see from your recent post #1 that you are located in Toronto Canada. Just curious about some of the earlier conversations: did you reach out to Spring Made regarding the Sapphire Millennium’s specs? To better understand what sorts of comfort/ support needs you have, what brand and type mattress are you currently using? What size is it and how old is it? What qualities do you like about your current mattress and what do you not like about it?
Unfortunately, TMU does not make recommendations for specific mattresses (read more about why in this tutorial here , particularly point #4) or mattress brands unless they are thoroughly vetted Trusted Members. I did check with our Canadian trusted members, and of them only one offers a twin mattress in your price range (MFC/ Memory FoamComfort); however, it is all-foam/ high quality HD foam, and you are looking for a innerspring/ pocketed coil support mattress. You may want to ask @Mario/MFC if he knows who may sell quality traditional mattresses in your area at a <$500 price point, you may post to MFC’s “Ask an Expert” forum here. Good luck with your research and let us know how things go.
Sensei
P.S. dominator, I can see that you are anxious to receive a quicker response to your posts by the “anyone” comment that you usually add. We understand that each consumer needs different kinds of information to aid in their decision making process, and we give each post a great deal of thought, research and consideration. We generally answer each post within 2-3 days, but we are a small team and sometimes it takes a little longer. While you are waiting, other consumers may drop in and share their story if your post title is more specific to your question as well, users often make a site search based on their interests and find posts to comment on or help with in that manner. Hope this helps explain our process a little better and looking forward to guiding you down the path to a better night’s sleep ;).