Try bringing them a designer purse, or designer wallet. Chica's definitely know that Louis Vuitton or Gucci or Prada stuff is very expensive, but they can't tell the difference between a real or a fake. And you can buy fake purses / wallets in just about any major city, from guys selling this stuff on the sidewalks in most busy metro areas.
For $25 or $30, you can buy a nice Louis Vuitton purse & matching wallet. Give it to your favorita, and watch her eyes light up. Just tell her that you were in N.Y. City on business, and you decided to "splurge" on her. If you play it right, it's very easy to get a TLN or a TFDS (todo fin de semana) out of that one! YMMV, but trust me on this one.........

But I would advise you to "feel her out" on it first. Some of the younger chica's do not know much about 'designer' products.
I haven't done this in quite a while, but last year (2 different trips) I negotiated a TLN from one Colombiana, and a TFDS from a Tica. In an email, I told the Colombiana that I had a surprise gift for her (a Louis Vuitton purse) fake of course, but she didn't know it. I bought it in Cabo San Lucas for $30. She promised me a real "dirty" TLN when I got to CR if I would give it to her, and she kept her promise. Now, I'll see her every 2 or 3 months, walking the beat in the BM, and she still carries that purse, and I'll still get a smile and a kiss from her. We don't session anymore, she's just a good Colombiana amiga.
Three months and two trips later, I spent a weekend at the beach with a Tica, and we got on the subject of designer stuff, and she told me that she loved Prada stuff, but couldn't afford it. And when I told her that I would be willing to buy her a "real" Prada bag in exchange for another weekend at the beach with her, she jumped at the mere mention of it. For $50 in Las Vegas, I got a nice (fake) Prada purse and matching wallet. I brought it for her, and we had another awesome weekend together a la playa. I saw her a few weeks later, on a following trip, but I haven't seen her since. Her phone was disconnected, and no return e-mails. I felt so used!!!
MG