I have only seen the HM-4 stand advertised online in the US at kawaius.com and at Kraft Music. Since the HM-4 stand appears to carry a minimum advertised price (MAP) of $309 USD, I doubt you can find it advertised in the US for less. (By the way of comparison, the HM-4 is advertised in Europe for 135 EUR ($184 USD).) The HM-4 has gotten good review but is pricey. Since the HM-4 is customized for the ES7 as well as the matching F301 lyre, it is your only option if you want a matching furniture style stand for the ES7.
If you are willing to move to a metal stand, there are many foldable options for 88-key pianos like K&M models 18810 &18950 (in $200 range), On Stage models KS7350 and WS8550 (in $100 range) and Quiklok model WS-550 (in $100 range), etc. which are adjustable and have options for adding a second tier. If you are playing from a seated position, you will want to avoid X-style stands and go for a table, Z or T-style keyboard or workstation stand. You will also want to make sure the height adjustment of the particular stand will allow the top of the keys to be positioned at the correct height when sitting --- the minimum height adjustment of some stands will not allow the stand to be lowered enough.
If the stand is for home use, you can skip the expense and complexity of a folding stand, and get a stand like Stellar Labs 555-13830 keyboard stand which I recently purchased for under $50 on Amazon to hold my new MP7 - search for Stellar Labs 555-13830. This particular stand is a matte black, heavy duty enhanced version of a Z stand with great height and width adjustability, an extra deep 20” top rail which will support even large keyboards like the MP11, and a build quality which is surprisingly good for its low price.