是的，pricey 中的 -y 是后缀。作为后缀的 -y 有以下用法（根据《韦氏高阶》）：

1. full or having a lot of something充满…的；有很多…的

a muddy river [=a river with a lot of mud in it] 浑浊的河流

dirty hands [=hands with a lot of dirt on them] 肮脏的手

2. having the qualities of something有…特征的

gooey [=wet and sticky like goo] 湿黏的

3. made of or seeming to be made of something由…做成的；似由…做成的

waxy 蜡质的

4. resembling something似…的

icy [=like ice; very cold] 冰冷的

wintry temperatures [=temperatures that are cold like winter temperatures] 寒冬般的低温

a homey atmosphere 像家一样舒适的氛围

5. very interested in something热衷于…的

outdoorsy [=enthusiastic about activities done outside] 喜爱户外活动的

6. tending to do something倾向于做…的

chatty [=tending to chat] 爱闲聊的

7. wanting or needing to do something想做…的；需要做…的

sleepy 昏昏欲睡的

8. causing or performing a specified action引发某行为的；表现出…的

a drowsy afternoon [=an afternoon that makes you feel ready to drowse/sleep] 令人昏昏欲睡的下午

curly hair [=hair that curls] 卷曲的头发

你的说 pricey 中的 -y 可套用第一条用法，但需变通一下，可理解为“……很高的”，即 pricey 的意思是“价格很高的”，也就是“昂贵的”，英语词典对 pricey 的解释是 high in price 或 charging high prices，有些词典则简单地用 expensive 来解释它。(注：pricey 也可拼成 pricy)

附相关例句：

The car is a little pricey. 这辆车有点贵。

Medical insurance is very pricey. 医疗保险很昂贵。

This restaurant is a bit pricey for me. 这家饭馆的价钱对我来说贵了些。

The clothes are beautiful but very pricey. 那些衣服很漂亮，不过价格很高。

The tickets were kind of pricey, but the show was good. 票价有点贵，但是演出很精彩。