[I also bought a small plant on the internet last year, Nerium oleander 'Barcelona'. It has taken well and has 8 or 9 new shoots coming up. No flowers as yet but I am hoping it will look like this (a slightly purple hint to it rather than pure pink)https://www.bing.com/images/search?view=detailV2&ccid=d5yyvqKT&id=FFA3DFFB839515559677819C58D95B044C266D11&thid=OIP.d5yyvqKToygoNqcojlr7-gHaFj&mediaurl=https%3A%2F%2Fth.bing.com%2Fth%2Fid%2FR779cb2bea293a3282836a7288e5afbfa%3Frik%3DEW0mTARb2VicgQ%26riu%3Dhttp%253a%252f%252fgardenbreizh.org%252fmodules%252fpix%252fcache%252fphotos_110000%252fGBPIX_photo_118150.jpg%26ehk%3Dk7buYG3P%252bqk8h%252bZwPLMOTmC8U0J5JaCPu5%252fT7A3UmkU%253d%26risl%3D%26pid%3DImgRaw&exph=400&expw=533&q=nerium+oleander+%27Barcelona%27&simid=608033958955131300&ck=A0BA7EC2EC41ED74E440AB634606D4AB&selectedindex=0&form=IRPRST&ajaxhist=0&ajaxserp=0&vt=0&sim=11
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The plant I referred to above is now flowering. If you are looking for a more unusual Oleander, 'Barcelona' could be interesting. It really does have a mauve tinge and the buds are dark with a near purple colour.