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Are there any methods to store spells of 9th level at a location, preferably in a manner that can be triggered in a manner similar to glyph of warding? Magic items could be accepted as the answer as well.
It needs to be a method that doesn’t require two 9th-level spell slots; using glyph of warding would require you to cast glyph of warding at 9th level, then the other spell at 9th level as well.
You assume in your question that there is no way to get 2 9th-level slots, but you can.
A 20th level wizard that the DM has granted a Boon of High Magic will be able to do this.
The Boon of High Magic says:
You gain one 9th level spell slot, provided you already have one.
Thus you would have 2 9th-level spell slots. One to cast glyph of warding at 9th-level (which then allows it to store a 9th-level spell) and the other to cast the 9th-level spell that you store into it.
Note that the 9th level spell that is cast into the glyph still has to follow all the restrictions laid out in the description of glyph of warding. Also note that Epic Boons are something entirely at a DM's discretion and only they can decide to bestow one on your character.
If you can get a 9th level scroll of glyph of warding you can use that to cast glyph of warding then 1 9th-level spell slot to cast the spell to store in it.
If you have a Spell Scroll of a 9th level spell, you might be able to use that as the spell to store in the glyph. If the spell on the scroll is one you don't have "prepared" as a character, then (depending on how your DM defines "prepared") it may or may not work. See this Q&A for more debate on this. It is similarly unclear if a scroll of a prepared spell will work (see this Q&A). In short, ask your DM about either of these options.
As always, the 9th-level spell wish can do anything you want it to (DM permitting) as long as you are willing to accept the risk of never being able to cast wish again. So, you could wish for a 9th-level spell stored in whatever manner you wanted. And, barring any DM twisting of the wish you would be able to do so using only 1 9th-level slot.
Note that you must fully cast wish into the glyph so the cast must make the wish, decide what effects they want, and suffer any stress required just like normal.
"You can store a prepared spell" so the spell you want to store must be prepared but if you can get access to a Spell Scroll with a 9th level Glyph of Warding on it you can use this.
The Tome of the Stilled Tongue (DMG, p. 208) allows this if you're a wizard attuned to it and use it as a spellbook. Once per day, you can cast any spell written in it as a bonus action:
If you can attune to this item, you can use it as a spellbook and an arcane focus. In addition, while holding the tome, you can use a bonus action to cast a spell you have written in this tome, without expending a spell slot or using any verbal or somatic components. Once used, this property of the tome can't be used again until the next dawn.
If you start casting Glyph of Warding one half hour before you end a long rest, you'll use up your 9th level spell slot immediately. Then, once you finish your long rest, you'll regain the spell slot you need. Then, once you finish casting the spell, you'll inscribe the magic glyph and cast the stored spell into it with your replenished 9th level slot. 16ish hours later, you can start the process again.
