I've bought a few of these myself over the past year or so, and I thought I would share my opinions on them with everyone else.
I've bought three different types of lights from China, one of them by accident! The three lights shown below are all from China, the two on the left being LED's and the light on the right using traditional incandescent bulbs.
The dual light LED lamppost below was something I mistakenly ordered (don't ask!). It might be a little obvious in the below photo, but they are much too large for N Scale. They are LED's (the bulbs seem to be 3mm LED's) are a nice warm white, and have the resistor already soldered in below the base of the lamp post, so they are ready to connect to your 12volt power supply. These were purchased from Xinsai Brakepads88 store on eBay, and they are labelled as "H12 75mm warm white LED" lamp posts. For an HO layout, I think this would suffice. Quality is okay, nothing special. They cost around $1.50 USD each.everestmodel, and they cost about $1.50 each as well. I like the look of these a lot, but next time I will order the 5cm versions for a little bit more height.
cnmodelnt and labelled as L327 5.8cm 12v lamp posts.
One product I've really enjoyed from cnmodelnt is their Dark Green trees! Below is the D9035 (9 cm) and the D7027 (7cm) trees in dark green. The 7 cm version are about $0.50 a piece, while the 9cm is closer to a dollar. The 7cm trees are okay for a small, growing tree, but seem to small for my tastes for something meant to represent a more mature forest. The 9cm version is much better at representing a more mature forest area.
One thing my urban environment has been lacking have been statues! I know a lot of modellers used various figures from war gaming, and this was my intention until I came across these. Also from cnmodelnt, these are labelled as DS04 Resin Sculpture Statue figures for HO and N. As the below N Scale figure shows, they may be a bit on the large size for N Scale statues, but I think they will serve just fine. The below photo shows them painted in a primer coat of black, awaiting some final coloring by hand before they are added to the layout. Again, these ran me about $1.00 a piece ($13.99 for a pack of 14, with apparently no duplicates) so a pretty decent value I think.
What about the little people? You know, those little plastic figures to help populate the layout? With quality figures from Woodland Scenics or Preisser costing quite a bit, populating your little metropolis can be quite expensive. Fortunately these cheap figures from seller wehonest are about one tenth the cost ($0.10 a piece) can help to fill in those empty sidewalks. I bought a package of 100 for $9.99 labeled as having 19 different poses.
For comparison sake, the three figures on the left in the below photo are from Preisser, while the figures to the right are the inexpensive Chinese imports
And for comparison sake, the rugged, handsome profile of this gentleman from Preisser:
Obviously, the quality of the painting and details are nowhere near the above mentioned Woodland Scenics or Preisser figures, but they are acceptable in my view for populating building interiors or scenes in the distance where details can't be seen anyway. And at $0.10 a piece, this is certainly a much funner option than the inexpensive, but unpainted, bulk packages from Preisser! So I'm very glad for this cheap, efficient option for population expansion!
That about sums it up! Hope this was in some small way a helpful guide to help you with your layout scenery decisions!