That's a tough one. My first thought was a Pikkolo or Beco Gemini if she is insistent on the facing out carry, but they are both more expensive then the Ergo. A mei tai (BabyHawk, FreeHand, Mei Tai Baby) would probably be comfortable for her and they are usually less expensive then soft structured carriers, but they don't really allow a facing out carry. They do offer the option of a high back carry though, which allows the baby to see over the wearer's shoulder. This is more ergonomic and usually more comfortable for the wearer then a facing out carry.Â
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If she's willing to buy used she can probably find a mei tai for around $50-60, and a soft structured carrier for $80-90. Another good option would be a woven wrap, again used she can probably find one for about $75. A woven wrap she would be able to use for front carries as well as hip and back carries, so basically it would pick up where her stretchy wrap left off.
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I hope your friend can find something that works soon. :)